CA1091333A - Sewing machine with a stitch pattern selecting device - Google Patents
Sewing machine with a stitch pattern selecting deviceInfo
- Publication number
- CA1091333A CA1091333A CA284,064A CA284064A CA1091333A CA 1091333 A CA1091333 A CA 1091333A CA 284064 A CA284064 A CA 284064A CA 1091333 A CA1091333 A CA 1091333A
- Authority
- CA
- Canada
- Prior art keywords
- pattern
- follower
- cam
- cam follower
- cams
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000009958 sewing Methods 0.000 title claims abstract description 18
- 230000002441 reversible effect Effects 0.000 claims description 68
- 230000007246 mechanism Effects 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000033001 locomotion Effects 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 230000006378 damage Effects 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000006870 function Effects 0.000 claims 1
- 230000007257 malfunction Effects 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 5
- 239000011295 pitch Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000035611 feeding Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B19/00—Programme-controlled sewing machines
- D05B19/02—Sewing machines having electronic memory or microprocessor control unit
Abstract
ABSTRACT OF THE DISCLOSURE
In a sewing machine with a stitch pattern selecting device according to the invention, the selection of stitch patterns is very simplified, and can be carried out in a short period of time.
In a sewing machine with a stitch pattern selecting device according to the invention, the selection of stitch patterns is very simplified, and can be carried out in a short period of time.
Description
13;33 This invention relates to a stitch pattern select-ing device for a sewing machine, and more particularly to a device which is compact in structure and positively operates to select the stitch patterns.
In this kind of conventional device, mechanical or electrical, the machine operator has to operate, for example, -one operating member to displace an indicator or the light of an indicating lamp to a desired pattern indicating position, and therefore if there are a substantial number of ~i 10 patterns to be selected, this increases the amount as well as the time of pattern selecting work. In the push button type of conventional pattern selecting device which directly selects a desired pattern, the number of cam followers and other associated elements consequently $
increases for the limited space within the machine frame.
Such a device also goes against the inclination of manu-facturers to reduce the weight of the sewing machine.
The device of the present invention seeks to over-come the defects and shortcomings of the prior art. It is a basic object of the invention to combine a reversible motor and a position senser for automatically operating the whole process of a pattern selection by means of a slight touch onto the concerned parts by the operator.
It is a second object of the invention to provide automatic or manual adjustment of the amount of the bight of the needle and of the cloth feed needed for stitch patterns.
It is a third object of the invention to be able to obtain buttonhole stitches with a variable amount of the ~' 30 bight of the needle and/or the feed by means of a suitable combination of electric control mechanisms.
: ..
~V~ 3 ' ` According to the invention there is provided in a sewing machine of the type comprising a pack of pattern cams rotatable in synchronism with sewing-machine operation and a cam follower coupled to the machine's stitch-forming instru-. mentalities and mounted to track selected ones of the pattern cams, an improved pattern-selection system comprising, in c combination, user-operated pattern-selecting means operated by the user for selecting a stitching pattern and generating ' when operated pattern-selection signals; a!,program-control - 10 unit including a static memory having inputs receiving the pattern-selection signals and having outputs, and producing q at its outputs, in response to the pattern-selection signals, . cam-selection and follower-control signals determined by what pattern the user has selected; electromagnetic follower-: control means responding to the follower-control signals by causing the cam follower to move out of engagement with the pack of pattern ca~s prelimlnary to axial shifting`of the follower from one to another of the pattern cams and operative for thereafter returning the cam follower into engagement with 20 - the pack of pattern cams; and cam-selectlng means responding to the cam-selection signals by causing the cam follower to shift in the direction axially of the pack of pattern cams ` from one pattern cam to the pattern cam corresponding to the pattern the user has selected, the cam-selecting means including a reversible electric motor having an electrical input and a mechanical output, motor-control circuit means having an input connected to receive the pattern-selection signals and having an oùtput connected to the electrical . input of the reversihle electric motor and controlling the energization and direction of operation of the latter, and coupling means coupling the mechanical output of the rever-sible electric motor to the cam follower for converting the
In this kind of conventional device, mechanical or electrical, the machine operator has to operate, for example, -one operating member to displace an indicator or the light of an indicating lamp to a desired pattern indicating position, and therefore if there are a substantial number of ~i 10 patterns to be selected, this increases the amount as well as the time of pattern selecting work. In the push button type of conventional pattern selecting device which directly selects a desired pattern, the number of cam followers and other associated elements consequently $
increases for the limited space within the machine frame.
Such a device also goes against the inclination of manu-facturers to reduce the weight of the sewing machine.
The device of the present invention seeks to over-come the defects and shortcomings of the prior art. It is a basic object of the invention to combine a reversible motor and a position senser for automatically operating the whole process of a pattern selection by means of a slight touch onto the concerned parts by the operator.
It is a second object of the invention to provide automatic or manual adjustment of the amount of the bight of the needle and of the cloth feed needed for stitch patterns.
It is a third object of the invention to be able to obtain buttonhole stitches with a variable amount of the ~' 30 bight of the needle and/or the feed by means of a suitable combination of electric control mechanisms.
: ..
~V~ 3 ' ` According to the invention there is provided in a sewing machine of the type comprising a pack of pattern cams rotatable in synchronism with sewing-machine operation and a cam follower coupled to the machine's stitch-forming instru-. mentalities and mounted to track selected ones of the pattern cams, an improved pattern-selection system comprising, in c combination, user-operated pattern-selecting means operated by the user for selecting a stitching pattern and generating ' when operated pattern-selection signals; a!,program-control - 10 unit including a static memory having inputs receiving the pattern-selection signals and having outputs, and producing q at its outputs, in response to the pattern-selection signals, . cam-selection and follower-control signals determined by what pattern the user has selected; electromagnetic follower-: control means responding to the follower-control signals by causing the cam follower to move out of engagement with the pack of pattern ca~s prelimlnary to axial shifting`of the follower from one to another of the pattern cams and operative for thereafter returning the cam follower into engagement with 20 - the pack of pattern cams; and cam-selectlng means responding to the cam-selection signals by causing the cam follower to shift in the direction axially of the pack of pattern cams ` from one pattern cam to the pattern cam corresponding to the pattern the user has selected, the cam-selecting means including a reversible electric motor having an electrical input and a mechanical output, motor-control circuit means having an input connected to receive the pattern-selection signals and having an oùtput connected to the electrical . input of the reversihle electric motor and controlling the energization and direction of operation of the latter, and coupling means coupling the mechanical output of the rever-sible electric motor to the cam follower for converting the
- 2 _ i333 '`:,`:`
motion generated by the reversible electric motor into axial shifting movement of the cam follower.
The invention is further illustrated by reference to the accompanying drawings illustrating particular and pre-ferred embodiments of the invention, in which:
`i FIGURE 1 is a perspective view of a pattern selecting device in a first embodiment of the invention, FIGURES 2 to 5 sh-ow ~iffe~ent embodiments of pattern selecting devices of the invention, FIGURE 6 is an electric block diagram of the ; l invention, -- FIGURE 7 is an electric circuit of the invention, FIGURE 8 is another embodiment of--a pattern ` selecting device of the invention, FIGURE 9 is a perspective view of a mechanism of the invention for exchanging the needle hole of the needle plate and for adjust-ing the height of the feed dog, FIGURES lO(a) and lO(b) depict the modified parts ~-~ of a modified version partly of the mechanism of Figure 8, FIGURE 11 is an electric block diagram for the embodiment of Figure 8, and FIGURE 12 is an electric block diagram for the embodiments of Figure 10.
With further reference to the drawings, in Figures 1 to 5 within the machine frame of a sewing machine (not shown) there is arranged a dynamic mechanical memory 1 storing a plurality of stitch patterns, namely a pack of cams to be rotated in synchronism with rotation of a main shaft (not shown) of the sewing machine. In this regard, .
~ 3 -, lO~ 3 :' such a mechanical memory 1 can be easily replaced by a magnetic memory. A read-out member 2, for example, a cam follower for extracting the information stored in the memory 1 is arranged opposite to the memory 1 and is displaceable along the memory 1. That is, the cam follower 2 with a boss
motion generated by the reversible electric motor into axial shifting movement of the cam follower.
The invention is further illustrated by reference to the accompanying drawings illustrating particular and pre-ferred embodiments of the invention, in which:
`i FIGURE 1 is a perspective view of a pattern selecting device in a first embodiment of the invention, FIGURES 2 to 5 sh-ow ~iffe~ent embodiments of pattern selecting devices of the invention, FIGURE 6 is an electric block diagram of the ; l invention, -- FIGURE 7 is an electric circuit of the invention, FIGURE 8 is another embodiment of--a pattern ` selecting device of the invention, FIGURE 9 is a perspective view of a mechanism of the invention for exchanging the needle hole of the needle plate and for adjust-ing the height of the feed dog, FIGURES lO(a) and lO(b) depict the modified parts ~-~ of a modified version partly of the mechanism of Figure 8, FIGURE 11 is an electric block diagram for the embodiment of Figure 8, and FIGURE 12 is an electric block diagram for the embodiments of Figure 10.
With further reference to the drawings, in Figures 1 to 5 within the machine frame of a sewing machine (not shown) there is arranged a dynamic mechanical memory 1 storing a plurality of stitch patterns, namely a pack of cams to be rotated in synchronism with rotation of a main shaft (not shown) of the sewing machine. In this regard, .
~ 3 -, lO~ 3 :' such a mechanical memory 1 can be easily replaced by a magnetic memory. A read-out member 2, for example, a cam follower for extracting the information stored in the memory 1 is arranged opposite to the memory 1 and is displaceable along the memory 1. That is, the cam follower 2 with a boss
3 is formed with a groove 9 in the circumference thereof.
A notch 5 formed in the cam follower 2 is engaged by a transverse shaft 8 supported by a pair of arms 6, 7 which are swingable around the shaft 4. The arm 7 has a lower end provided with a fork 10 which is engaged by a pin 13 of a swing arm 11. A pin 16 positioned on a transmission rod 15 is pressed to one side 14 of the swing arm 11 by means of a spring (not shown). The transmission rod 15 is at the one end connected to a link 17 which is adjustably turned by operation of a bight adjuster (not shown) provided out-side of the machine frame, and is at the other end connected to a swingable frame supporting the'needle bar (not shown). One end of the shaft 8 between the arm members 6, 7 is in engagement with an oblong hole 21 of a , bar 19 of an electric driver 18 which may be a magnetic solenoid. Therefore, the shaft 8 can be swung around the shaft 4 by the electric driver 18 and the read-out member 2 can be engaged to and disengaged from the pack of cams 1.
The read-out member 2 is connected to a reversible motor 22, for example, a servGmotor, which displaces the member 2 along the pack of cams 1. A moving member 25 is mounted on a - transverse threaded shaft 26 and has a pin 23 engaging the ; groove 9 of the c~am follower 2. The member 25 has a fork portion 24 engaging the shaft 4 for preventing the member 25 from swinging on the shaft 26. Since a spiral groove 27 formed around the outer circumference of the shaft 2~ is engaged by an inner projection (not shown) of the moving
A notch 5 formed in the cam follower 2 is engaged by a transverse shaft 8 supported by a pair of arms 6, 7 which are swingable around the shaft 4. The arm 7 has a lower end provided with a fork 10 which is engaged by a pin 13 of a swing arm 11. A pin 16 positioned on a transmission rod 15 is pressed to one side 14 of the swing arm 11 by means of a spring (not shown). The transmission rod 15 is at the one end connected to a link 17 which is adjustably turned by operation of a bight adjuster (not shown) provided out-side of the machine frame, and is at the other end connected to a swingable frame supporting the'needle bar (not shown). One end of the shaft 8 between the arm members 6, 7 is in engagement with an oblong hole 21 of a , bar 19 of an electric driver 18 which may be a magnetic solenoid. Therefore, the shaft 8 can be swung around the shaft 4 by the electric driver 18 and the read-out member 2 can be engaged to and disengaged from the pack of cams 1.
The read-out member 2 is connected to a reversible motor 22, for example, a servGmotor, which displaces the member 2 along the pack of cams 1. A moving member 25 is mounted on a - transverse threaded shaft 26 and has a pin 23 engaging the ; groove 9 of the c~am follower 2. The member 25 has a fork portion 24 engaging the shaft 4 for preventing the member 25 from swinging on the shaft 26. Since a spiral groove 27 formed around the outer circumference of the shaft 2~ is engaged by an inner projection (not shown) of the moving
- 4 -<3~
member 25, this member 25 is axially moved upon rotation of the shaft 26. The drive shaft 26 has a worm wheel 29 secured thereto, which is in engagement with a worm 28 secured on the rotatable shaft of the reversible motor 22.
A position senser 30 for the read-out member 2 is mechanically connected to the reversible motor 22, The embodiments in Figures 1 and 4 comprise, for example, a rotary potentiometer fixed to a bracket (not shown) and its rotary portion 30 is fixed to the drive shaft 26. Figure 2 shows a sheet resistor 31 arranged in parallel with the dEive shaft 26 and engaged by a contact 32 projecting from the moving member 25, Figure 3 shows a worm wheel 33 on a vertical shaft 34 in engagement with the worm 28 of the reversible motor 22, The rotary portion of a rotary potentiometer 35 is fixed to the lower end of the shaft 34 and a cam 36 is secured to the upper end of the shaft 34. A lever 37 pivoted at its center is at one end thereof in engagement with the cam 36 and has a pin 38 fixed to the other end thereof engaging the groove 9 of the boss of the cam follower 2, In the embodiment shown in Figure 4, in order to exactly position the cam follower 2 and the moving member 25, the member 25 is formed with a groove 39, into which a pin 40 fixed to the cam follower 2 is placed, A toothed bar 41, which is to engage the pin 40, is turnable on the shaft 26 by the action of the magnetic solenoid 18 which has the bar 20 in engage-ment with a pin 42 of the toothed bar 41, as shown, Another embcdiment shown in Figure 5 comprises a device for exactly positioning-the cam follower 2, A pin 43 is, as shown,, provided on the cam follower 2 so that it may be engaged by any one of holes 45 of a positioning plate 44 at each selected position of the cam follower 2,
member 25, this member 25 is axially moved upon rotation of the shaft 26. The drive shaft 26 has a worm wheel 29 secured thereto, which is in engagement with a worm 28 secured on the rotatable shaft of the reversible motor 22.
A position senser 30 for the read-out member 2 is mechanically connected to the reversible motor 22, The embodiments in Figures 1 and 4 comprise, for example, a rotary potentiometer fixed to a bracket (not shown) and its rotary portion 30 is fixed to the drive shaft 26. Figure 2 shows a sheet resistor 31 arranged in parallel with the dEive shaft 26 and engaged by a contact 32 projecting from the moving member 25, Figure 3 shows a worm wheel 33 on a vertical shaft 34 in engagement with the worm 28 of the reversible motor 22, The rotary portion of a rotary potentiometer 35 is fixed to the lower end of the shaft 34 and a cam 36 is secured to the upper end of the shaft 34. A lever 37 pivoted at its center is at one end thereof in engagement with the cam 36 and has a pin 38 fixed to the other end thereof engaging the groove 9 of the boss of the cam follower 2, In the embodiment shown in Figure 4, in order to exactly position the cam follower 2 and the moving member 25, the member 25 is formed with a groove 39, into which a pin 40 fixed to the cam follower 2 is placed, A toothed bar 41, which is to engage the pin 40, is turnable on the shaft 26 by the action of the magnetic solenoid 18 which has the bar 20 in engage-ment with a pin 42 of the toothed bar 41, as shown, Another embcdiment shown in Figure 5 comprises a device for exactly positioning-the cam follower 2, A pin 43 is, as shown,, provided on the cam follower 2 so that it may be engaged by any one of holes 45 of a positioning plate 44 at each selected position of the cam follower 2,
- 5 -- 10~ 3~
.
~ Such an embodiment may be regarded as equivalent to the above .~ ~
mentioned one.
As shown in Figure 6, a selector 51 for selecting stitch patterns is provided on the outside of the machine frame of the sewing machine. A different signal is issued for each of the selectable stitch patterns by operation of the selector 51. An output signal from the selector 51 is converted in a digital-analog converter 52. The D/A converter . .
52 and potentiometer 30 or 31 or 35 are connected to a power amplifier 53 so as to compare the converted analog output signal with a position-indicating signal from the potentio-meter. Namely they are so connected to compare the command voltage from the pattern selector 51 with a feedback voltage from the potentiometer, i.e., a variable resistor 30 or 31 or 35 which is driven by reversible motor 22, so that the motor 22 may be driven until the potential difference becomes 0. The power amplifier 53 is connected to a sole-noid driving circuit 54 for actuating the solenoid 18 to release the cam follower 2 from the pack of cams L
Reference will now be made to the electric circuit shown in Figure 7. Pattern selecting switches SWl-SW4 are grounded at their left ends and are connected to input terminals Dl-D4 of a latch circuit at their right ends.
Resistors Rl-R4 are biasing resistors. When one of the switches SWl-SW4 is selected, one input of NAND circuit NANDl goes to low level(O~ and its output goes to high level (5V).
The output of NANDl is connected to the trigger terminal B
of a monostable multivibrator circuit MM, and when the output of NANDl changes from the low level to the high level, the monostable multivibrator is triggered and the output Q
goes to high level for a certain period of time. Since the output Q of the monostable multivibrator circuit MM is
.
~ Such an embodiment may be regarded as equivalent to the above .~ ~
mentioned one.
As shown in Figure 6, a selector 51 for selecting stitch patterns is provided on the outside of the machine frame of the sewing machine. A different signal is issued for each of the selectable stitch patterns by operation of the selector 51. An output signal from the selector 51 is converted in a digital-analog converter 52. The D/A converter . .
52 and potentiometer 30 or 31 or 35 are connected to a power amplifier 53 so as to compare the converted analog output signal with a position-indicating signal from the potentio-meter. Namely they are so connected to compare the command voltage from the pattern selector 51 with a feedback voltage from the potentiometer, i.e., a variable resistor 30 or 31 or 35 which is driven by reversible motor 22, so that the motor 22 may be driven until the potential difference becomes 0. The power amplifier 53 is connected to a sole-noid driving circuit 54 for actuating the solenoid 18 to release the cam follower 2 from the pack of cams L
Reference will now be made to the electric circuit shown in Figure 7. Pattern selecting switches SWl-SW4 are grounded at their left ends and are connected to input terminals Dl-D4 of a latch circuit at their right ends.
Resistors Rl-R4 are biasing resistors. When one of the switches SWl-SW4 is selected, one input of NAND circuit NANDl goes to low level(O~ and its output goes to high level (5V).
The output of NANDl is connected to the trigger terminal B
of a monostable multivibrator circuit MM, and when the output of NANDl changes from the low level to the high level, the monostable multivibrator is triggered and the output Q
goes to high level for a certain period of time. Since the output Q of the monostable multivibrator circuit MM is
- 6 -..
,- .
`:
connected to the latch terminal Cp of the latch circuit, the signals of the input terminals Dl-D4 are latched when the input terminal Cp is at high level, and are transmitted to the outputs Ql-Q4. NAND2 and NAND3 are provided for encoding the outputs Ql-Q4 of the latch circuit.
The relation between the pattern selecting switches and the associated elements is as follows:
Pattern selecting switches Latch circuits SWl SW2 SW3 SW4 Ql Q2 Q3 Q4 0 x x x L H H H
x 0 x x H L H H
x x 0 x H H L H
x x x 0 H H H L
' ~ Codes ,; Luminous diodes `~ NAND2 NAND3 LEDl LED2LED3 LED4 H L I X O X X
L H X X O X
H H X X X O
(L: Low level H: High level) The outputs Ql-Q4 of the latch circuit are connected - to the luminous diodes LEDl-LED4 vla voltage limiting resistors R5-R~8. The outputs of NAND2 and NAND3 are converted from ditigal to analog in an operational amplifier OPl having ' a ladder network composed of resistors R9-R12. The analog output voltage from converter 52 is compared with the feedback voltage furnished by the variable resistor VR of feedback potentiometer 30 and to this end is transmitted via a resistor R15 to the inverting input of an operational-; 30 amplifier OP2. R14 and R16 designate ordinary operational amplifier feedback resistors and R17 is a resistor trans-mitting the feedback voltage from VR likewise to the inverting
,- .
`:
connected to the latch terminal Cp of the latch circuit, the signals of the input terminals Dl-D4 are latched when the input terminal Cp is at high level, and are transmitted to the outputs Ql-Q4. NAND2 and NAND3 are provided for encoding the outputs Ql-Q4 of the latch circuit.
The relation between the pattern selecting switches and the associated elements is as follows:
Pattern selecting switches Latch circuits SWl SW2 SW3 SW4 Ql Q2 Q3 Q4 0 x x x L H H H
x 0 x x H L H H
x x 0 x H H L H
x x x 0 H H H L
' ~ Codes ,; Luminous diodes `~ NAND2 NAND3 LEDl LED2LED3 LED4 H L I X O X X
L H X X O X
H H X X X O
(L: Low level H: High level) The outputs Ql-Q4 of the latch circuit are connected - to the luminous diodes LEDl-LED4 vla voltage limiting resistors R5-R~8. The outputs of NAND2 and NAND3 are converted from ditigal to analog in an operational amplifier OPl having ' a ladder network composed of resistors R9-R12. The analog output voltage from converter 52 is compared with the feedback voltage furnished by the variable resistor VR of feedback potentiometer 30 and to this end is transmitted via a resistor R15 to the inverting input of an operational-; 30 amplifier OP2. R14 and R16 designate ordinary operational amplifier feedback resistors and R17 is a resistor trans-mitting the feedback voltage from VR likewise to the inverting
- 7 _ - ~O~i:3~3~
' input of operational amplifier OP2. The command voltage from converter 52 is, as already stated, in analog form and, due to the user of the encoding NAND-gates NAND2, NAND3 and the ladder network R9-R12, has a vlaue indicating what the desired position of cam follower 2 is to be. In accordance with usual servo principles, the non-zero output - voltage at the output of OP2 causes motor 22 to turn, and thereby shift follower 2 and correspondingly change the setting of potentiometer 30, 31 or 35 until the difference between the commanded and actual positions of follower 2 goes to zero, A circuit 54 for operating the follower releasing solenoid S.L. 18 actuates transistors Trl and Tr2 via resistors R20 and R22 connected to the power amplifier OP2 53.
When the power amplifier OP2 53 issues a positive voltage, the transistor Trl is biased in the forward direction and r~ becomes conductive while the transistor Tr2 is biased in the reverse direction to be nonconductive. ~ -i,:
- Since the transistor Tr3 is connected via the resistor R25 to the transistor Trl, the transistor Tr3 becomes conductive when the transistor Trl is conductive (and vice ' versa). Therefore, the transistor Tr4 becomes conductive via j the resistor R27 to subsequently energize the follower r.; releasing solenoid S.L. 18. If the output of the power amplifier OP2 53 is a negative voltage, the transistor Trl is biased in the reverse direction and the transistor Tr2 is biased in the forward direction to be conductive. Therefore the transistor Tr4 becomes conductive vla the resistor R26 for energizing the follower releasing solenoid S.L 18.
~ Namely, the positive or negative voltage from the power ~~30 amplifier OP2 53 energizes the solenoid 18. The transistors Trl and Tr2 are both nonconductive when the voltage divided by the resistors R20, R21 or- R22, R23 is lower than the base-,,: . ' ,
' input of operational amplifier OP2. The command voltage from converter 52 is, as already stated, in analog form and, due to the user of the encoding NAND-gates NAND2, NAND3 and the ladder network R9-R12, has a vlaue indicating what the desired position of cam follower 2 is to be. In accordance with usual servo principles, the non-zero output - voltage at the output of OP2 causes motor 22 to turn, and thereby shift follower 2 and correspondingly change the setting of potentiometer 30, 31 or 35 until the difference between the commanded and actual positions of follower 2 goes to zero, A circuit 54 for operating the follower releasing solenoid S.L. 18 actuates transistors Trl and Tr2 via resistors R20 and R22 connected to the power amplifier OP2 53.
When the power amplifier OP2 53 issues a positive voltage, the transistor Trl is biased in the forward direction and r~ becomes conductive while the transistor Tr2 is biased in the reverse direction to be nonconductive. ~ -i,:
- Since the transistor Tr3 is connected via the resistor R25 to the transistor Trl, the transistor Tr3 becomes conductive when the transistor Trl is conductive (and vice ' versa). Therefore, the transistor Tr4 becomes conductive via j the resistor R27 to subsequently energize the follower r.; releasing solenoid S.L. 18. If the output of the power amplifier OP2 53 is a negative voltage, the transistor Trl is biased in the reverse direction and the transistor Tr2 is biased in the forward direction to be conductive. Therefore the transistor Tr4 becomes conductive vla the resistor R26 for energizing the follower releasing solenoid S.L 18.
~ Namely, the positive or negative voltage from the power ~~30 amplifier OP2 53 energizes the solenoid 18. The transistors Trl and Tr2 are both nonconductive when the voltage divided by the resistors R20, R21 or- R22, R23 is lower than the base-,,: . ' ,
- 8 _ . ' ' :
~.~)9i~
emitter voltage VBE of the transistor Trl or Tr2.
Thus, in the embodiments of the invention, when a stitch pattern is selected by operating one of the pattern selecting switches of selector 51, a signal is issued, and the solenoid 18 is energized to disengage the read-out member 2 from the mechanical memory 1, and then the reversible motor 22 is driven. This reversible motor displaces the moving member 25 on the shaft 26 relative to the mechanical memory 1 through the worm 28 and the worm wheel 29. The displac~ment of the cam follower 2 continues until the potential difference becomes 0 between the command voltage from the D/A converter 52 and the voltage fed back from the position senser 30. Thus, the follower member 2 is exactly stopped at the desired position relative to thè mechanical memory or the pack ofipattern cams 1.
Reference will now be made to another embodiment shown in Figure 8. Within the machine frame of the sewing machine (not shown) there is arranged a mechanical memory 55 which stores a plurality of stitch patterns, namely a pack of disc-like cams to be rotated in synchronism with rotation of the main shaft of the sewing machine (not shown).
A first read-out member 56, namely, a cam follower, for extracting information from the memory 55, is arranged opposite to the memory 55. The cam follower 56 with a boss , 56a is slidably mounted on a shaft 57 and is slidable in parallel to and relative to the pack of pattern cams 55.
The b~s 56a is formed with a groove 56c in the-circumference thereof. A fork 56b formed in the lower end of the cam follower 56 engages a transverse shaft 60 supported between ~;30 a pair of arms 58, 59 which are swingable around the shaft 57. A swing arm 61 is swingably mounted at one end of the shaft 57 and is, at the lower end thereof, _onnected to one ` , -" l()~i;.~3~
end of the shaft 60. Therefore the swing arm 61 is swung ` around the shaft 57 when the cam follower 56 is swurg around the shaft 57. A pin 63 positioned on a transmission rod 62 `~ is pressed against an inclined face 61a of the swing arm 61 by means of a spring (not shown). The transmission rod 62 is at one end connected to a swing frame (not shown) support-, . .
ing the needle bar and is at the other end connected to a ., .
link 69 which is in turn connected to an adjusting arm 68 which is turnably mounted on the machine frame by means of a pivot 67 and is urged by a spring 66 to a bight adjusting arm 65 fixed to a bight control shaft 64 which is rotatably supported on the machine frame. A manually operated dial 70 is mounted on one end of the shaft 64 which projects out of the machine frame. The bight adjusting cam 65 is connected to a reversible motor M2, for example, servometer, via a gear wheel 72 secured to the control shaft 64 and a pinion 71 fixed to the rotary shaft of the reversible motor M2. A
position detector VR2 is also mounted on the control shaft 64 for sensing the position of the reversible motor M2.
' 20 The second read-out member 73, the feed control cam follower, is arranged opposite to the memory 55. The f,eed control cam follower 73 with a boss 73a is slidably mounted on the shaft 57 and is slidable in parallel to and relative to the pack of cams 55. The boss 73a is formed with a groove 73c in the circumference thereof. A fork 73b formed in the cam follower 73 engages a transverse shaft 76 supported by the arm 74 and by the feed control arm 75 which are swingably mounted on the shaft 57. The feed contr 1 arm 75 is at its one end connected to a feed adjusting rod 77 which is connected to a feed adjusting device (not shown) for adjusting the feed-ing amount and the feeding direction. A pawl 75a at the other end of the feed control arm 75 is, by the action of the `' -~ spring 80, in engagement with a feed controlling cam 79 secured to a feed controlling shaft 78 which is rotatably , supported on the machine frame. A manually operated dial 81 is fixed to one end of the shaft 78 which projects out of the machine frame.
The feed adjusting cam 79 is connected to a reversible motor M3 via a gear wheel 83 which is secured to the control shaft 78 and engages a pinion 82 flxed to the rotary shaft of the reversible motor M3. A position detector VR3 is mounted on the shaft 78 for sensing the position of the reversible motor M3. The grooves 56c, 73c of bosses 56a, 73a of the cam followers 56, 73 are respectively engaged by pins 86a, 87a each provided at one end of a bight selecting lever 86 and of a feed selecting lever 87 which are each turnable on pivot shafts 84, 85. Pawls 86b, 87b each formed at the other end of the selecting levers 86, 87 are engaged by a spring 91 with a bight selecting cam89 and a feed selecting cam 90, respectively, which are fixed on a vertical shaft 88 rotatably supported on the machine. The selecting cams 89, 90 are connected to a reversible motor Ml via a gear 93 which is secured to the shaft 88 and engages a pinion 92 fixed to a rotary shaft of the reversible - motor (Ml). A position detector VRl is mounted on the shaft 88 for sensing the positlon of the reversible motor Ml.
Figure 9 shows an embodiment for changing the needle hole of a needle plate and for adjusting the height of a feed dog. Reference will now be made to this embodiment.
A slide element 95 is formed with a small hole for a straight stitching and is slidingly movable on the needle plate relative to the slot-type needle hole of the needle plate.
The element 95 is at one end connected to one end of a lever 97 pivoted on a shaft 96 via an elastic member 98, and a pawl .
1.3~3;~
.
- 97a formed at the other end of the lever 97 is engaged by a ~ spring 101 to a cam 100 which is secured to a shaft 99 - rotatably supported on the machine frame. A plunger 104 engaging the under side of a feed plate 103 formed with a feed dog 102 is connected via an elastic member 107 to one end of a lever 106 pivoted on a shaft 105. A pawl 106a formed at the other end of the lever 106 is engaged by a spring 109 to a cam 108 fixed to the shaft 99. The cams - 100, 108 are connected to reversible motor M4 via a gear secured to the shaft 99 and engaging a pinion 110 of,the reversible motor M4. A position detector VR4 is provided " for sensing the position of the-reversible motor M4.
'~ Figure 10 shows another embodiment according to the invention. In Figure lO(a), the bight adjusting shaft 64 shown in Figure 8 is terminated at the bight adjusting cam 65, and a manual bight adjusting shaft 112 is rotatably supported on the machine frame in parallel to the shaft 64.
A manual bight adjusting dial 70a is secured to one end of the shaft 112 and a manual bight adjuster RB is mounted on the other end of the shaft 112. In Figure lO(b), the feed adjusting shaft 78 shown in Figure 8 is terminated at the feed adjusting cam 79, and a manual feed adjusting shaft 113 is rotatably supported on the machine -frame. A ~anual feed adjusting dial 81a is secured to one end of the shaft 113 and a manual feed adjuster RF is mounted on the other end of the shaft 113.
The operation of the embodiment in Figure 8 will be discussed. If any one of the pattern selecting switches provided on the front part of the sewing machine is operated, the following operation is-performed in steps which have been ~ in advance electrically programmed. A solenoid for the - clutch mechanism!(not shown) is actuat~d to rotate the machine ~ - 12 _ lO9i;33;~
, motor at a low speed so as to stop the needle bar at the upper dead point. Subsequently, each of the reversible motors M2, M3 is rotated to disengage the bight cam follower 56 and the feed cam follower 73 from the pack of cams 1, and then the motors are stopped.
At the same time, the reversible motor M4 in Figure 9 is rotated to operate the slide element 95 and the plunger 104 so as to determine the needle hole and the height of the feed dog 102 in accordance with the pattern selected, and then the motor 114 is stopped. Subsequently the reversible motor Ml is xDtated to displace the followers ~r 56, 73 along the pack of cams 1 to the selected ones of these -~ cams 1, and then the motor Ml is stopped. Then the reversible ; motors M~, M3 are again rotated to engage the cam followers 56, 73 to the respective selected cams via the transmission rod 62 and the swing shaft 60, and via feed control arm 75 and the swing shaft 60 respectively, and then the motors M2, M3 are stopped. Thus, the manual bight adjusting dial 70 and the manual feed adjusting dial 81 can now be used to pro-vide the manual adjustment if desired, the automatic setting for pattern selecti onhaving been finished. In case the buttonhole stitch is selected by the corresponding pattern selecting switch, the automatic setting is of course possible therefor, but if desired manual adjustment is carried out by the dials 70, 81 and then the manually selected value is memorized electrically. For example, if the pattern selecting switch for the buttonho stitch is operated to form the first left sid~ line tack stitches, the following right side line tack stitches are formed with the same bight and with - 30 the same feeding pitch. Thereafter, the stitching in accordance with the manual setting will be repeated for each successive opeFation. It is possible to again return to the -7~ - 13 -, automatic setting by once pushing another pattern selecting switch.
In the embodiment of Figure 10, when any one of the pattern selecting switches (S) is operated, the needle bar stops at the upper dead point, and the followers 56, 73 are , disengaged from the pack of cams 1 by the reversible motors ~'r' M2, M3, and at the same time the slide element 95 and the , . .
' plunger 104 in Figure 9 adjust the needle hole and the , height of the feed dog 102 in accordance with the selected ` 10 pattern by operation of the reversible motor M4. Subsequently the reversible motor Ml is rotated to displace the followers 56, 73 along the cams 1 to the selected ones. Subsequently the bight adjusting rod 62 and the feed adjusting rod 77 are moved by the reversible motors M2, M3 to the position .; associated with the selected pattern, and the clutch mechanism , is released and the automatic setting for pattern selection is finished. Then these motors M2, M3 however, remain active in a steady-state condition, differentially from the embodiment in Figure 8. Subsequently when the manual bight adjusting dial 70a and the manual feed adjusting dial 81a are adjusted to desired positions, and then one or both of a manual bight switch~and a manual feed switch on the machine frame is operated, the resultant data are issued to rotate one or both of the reversible motors M2, M3 and the bight adjusting rod 62 and the feed adjusting rod 77 are operated respectively to the adjusted positions. Thus, the manual setting is finished. When the pattern selecting switch S
is again operated, the manual setting is switched to the above mentioned automatic setting; if another pattern selecting switch is operated, the automatic setting of a different pattern is obtained.
,~
' - - 14 -.....
An explanation will be made of the electric circuit shown in Figure 11 which is used in combination with the embodiment of this invention shown in Figure 8 and Figure 9.
Pattern selecting switches Sl-S8 of a pattern selector S are arranged on the front part of the sewing machine, and , are each at one end grounded and at the other end connected to ; the input terminals Dl-D8 of a program control unit PCU.
.. . .
- Vcc is a DC power source for the control circuit. R-R are normal biasing resistors which make the values of the input terminals Dl-D8 of the program control unit PCU 1 or O in - response to opening or closing of the switches Sl-S8. The program control unit PCU is responsive to the signals received at the input terminals Dl-D8 and the input terminals INl, IN2, IN3, and issues at the output terminals OUTl-OUT6 the signals for controlling the reversible motors Ml-M4, ,~
power amplifiers A2, A3 and the magnetic solenoid SOL for the clutch mechanism stopping the sewing machine at a pre-determlned position. The respective output terminals OUTl-OUT4 are connected to D/A converters DAl-DA4, summing junctions (a)-(d), power amplifiers Al-A4, and to the reversible motors Ml-M4. The outputs of position detectors VRl-VR4, which de~ect the positions of the cams 65, 79, 89, 90, 100, 108, driven by these motors are respectively connected to the junctions (a)-(d) where the outputs of the position detectors and the data from the converters ADl-AD4 are respectively compared. If there are differences between the compared data, the revers~ble motors continue to rotate. If the compared data are each equal, the reversible motors Ml-: M4 are stopped in a steady-state condition. Namely when the output data of the D/A converters match the data at the positions of said cams; the outputs of the respective power amplifiers Al-A4 become 0, and the reversible motors Ml-M4 , ~ - 15 _ are stopped. The outputs of the position detectors VR2, VR3 are each connected to input terminals IN2, IN3 respectively of the program control unit PCU via A/D converters AD, AD', ~ so that the data of the respective position detectors may be ^~- memorized by the unit PCU. When one of the pattern selecting switches S, for example a switch for a buttonhole is selected, the position detectors VR2, VR3 memorize-the data when they are adjusted by the manual dials 16, 27 for the needle bight and the cloth feed, and enable the sewing machine to repeatedly form a pattern exhibiting the selected ,~ bight and feed pitch. The output terminal OUT6-is for ~-` making 0 the outputs of the power amplifiers A2j A3, whèn the automatic setting of a pattern selection is finished, to render the reversible motors M2, M3 inactive, and the motors will not be affected if the detectors VR2, VR3 are manually adjusted. A magnetic solenoid SOL is operated by a signal from the output terminal OUT5 of the program control unit PCU to connect and disconnect the main shaft of the sewing machine to and from the clutch mechanism CL-for stopping the needle bar at a predetermined position (the upper dead point in this case). An actuating part of the solenoid is equipped with a switch for operating a driving circuit CM
of the machine motor. Therefore when the solenoid is energized the machine motor MS can be rotated at a low speed, irrespectively of a controller (not shown) of the sewing machine. When the needle bar has been brought to the upper dead point, the needle bar is stopped there by the clutch mechanism CL, and at the same time a signal detecting , the needle bar at the upper dead point is given to the input terminal INl, and the machine motor MS continues to idly rotate until said solenoid is deenergized.
''' " . ' Explanation will be made of the embodiment in Figures 10(a) and 10(b) in combination with the mechanism in Figure 9 and controlled by the electric circuit in Figure 12.
In the electric circuit, SB is a manual bight control switch.
SF is a manual feed control switch. They are each at one end grounded and are each at the other end connected to input terminals IN6 of a program control unit PCU.' After any one -'~, of the pattern selecting switches Sl-S8 is operated, the manual operation of one or both of the switches SB, SF will provide the following manual adjusting operation. AS2, A'S3 are analog switches and usually render the automatic side effective as shown. These analog switches cause'one or both of the manual bight adjustor RB and the manual feed adjuster RF to be effective through the signals from the output terminals OUT6, OUT6' of the program control unit PCU when one or both of the switches SB, SF isjare operated.
The operation of the electric circuit is as follows:
In Figure 11, when any one of the pattern selecting switches Sl-S8 is operated, the magnetic solenoid SOL is energized by a signal from the output terminal OUT5 of the program control unit PCU to make effective the clutch mechanism CL
for stopping the needle bar at the determined position, and to operate the drive circuit CM of the machine motor MS to rotate the machine motor at a low speed. The sewing machine is stopped by the clutch mechanism CL when the needle bar has been raised to the upper dead point, and the machine ' motor continues to idly rotate. When a signal confirming the needle bar at the upper dead point is given to the input terminal INl, the reversible motors M2, M3 are rotated by signals from the output terminals OUT2, OUT3 until the --pattern cam followers 56, 73 are disengaged from the pack of cams 1, whereupon,motors M2, M3 have now reached a steady-.
- 17 _ 3 ~
.`:
state and therefore stop. Simultaneously the reversible motor M4 is rotated by the signals issued from the output terminals oUT4 by the selected switch, and moves the slide element 95 and the feed dog 104 to the positions associated with the selected pattern, and then the motor is stopped in a steady-state. Subsequently the reversible motor Ml ;-~` is rotated by the signals from the output terminals OUTl, ;: ~
and displaces the cam followers 56, 73 relative to the pack ` of cams 1 to be selected ones thereof, and then the motor is stopped. Then the reversible motors M2, M3 are re-rotated by the signals from the output terminals OUT2, OUT3 to engage the cam followers 56, 73 to the selected cams, and also to adjust the bight adjusting rod 62 and the feed adjusting rod 77 to'the relative positions in accordance to the selected pattern. Simultaneously the solenoid SOL
is deenergized to stop the machine motor MS, the outputs ' from the power amplifiers A2, A3 are made O by the signal fromthe output terminal 0UT6, and the reversible motors M2, M3 are made inactive. Thus the automatic pattern selection - 20 is finished. IIf then manual adjustment is further desired, the bight and the feed can be adjusted by operating the respective manual controldials 70, 81. In this case, the setting values of the position detectors VR2, VR3 are varied, , but the reversible motors M2, M3 will not be re-rotated.
'~ When the buttonhole stitch is selected by one of the switches Sl-S8, the automatic setting is provided as explained above, and subsequently the manual adjustments can be performed using the manual adjusting dials 70, 81. ~amely in the first place, a switch for the left side line tack ~; .
stitches of a buttonhole is operated, and then the manual adjusting dials 70, 81 are operated to determine the bight and feed pitches in accordance to the selected buttonhole. After - 18 _ the left side line tack stitches have been terminated, a switch for the rlght side line tack stitches is operated, Then the program control unit PCU is operated to automatically select a cam for such stitches, and after that, the reversible motors M2, M3 are re-rotated to automatically set the bight and the feed pitches which are the same as those of the just sewn left side line tack stitches based on the data memorized from the previously operated manual adjusting dials 70, 81. The subsequent left line tack stitches and the right line tack stitches can be provided by repeated operations of the two switches with the same needle bight and the same feed pitches, For returning to the automatic setting, a pattern selecting switch other than the buttonhole switches is operated.
In Figure 12 showing another embodiment, when any one of the pattern selecting switches Sl-S8 is opèrated, i the needle bar is stopped at the upper dead point as in the preceding embodiment and the cam followers 56, 73 are disengaged from the cams 1 by the reversible motors M2, M3, and then the respective motors are stopped. At the same time the reversible motor M4 moves the slide element 95 and the feed dog 104 to the positions associated with the -selected pattern, and then the motor is stopped. Then the ;~ reversible motor Ml displaces the cam followers to the selected positions relative to the cams 1. Subsequently, the reversible motors Moe, M3 engage the cam followers to the ? selected cams and also adjust the bight adjusting rod 62 and the feed adjusting rod 77 to the positions associated with the selected pattern and then the motors are stopped.
Then the solenoid SOL is deenergized and the machine motor MS is stopped to finish the automatic selecting of pattern cams, When manual adjustment is desired, either or both of '.E~ - 19 _ - , .
~J9i3~33 ,:..
the manual bight switch SB and the manual feed switch SF is/
are operated to connect in the manual bight adjustor RB and/
or the manual feed adjustor RF. If one or both of the manual adjusting dials 70a, 81a is/are operated before or after this change-over, the generated data are memorized . in one or both of the adjustors RB,RF, and one or both of the reversible motors M2, M3 is/are rotated to operate the bight adjusting rod 62 and the feed adjusting rod 77 to the positions determined by the memorized data, and thus the manual setting is finished. In this ernbodiment, the buttonhole can be obtained;in the same manner as in the preceding ernbodlment;shown in Figures 8, 9 and 11.
: ~ .
.. ' ~ .
~
.,~.,: . ,.
:
., '`'';
~ - 20 -
~.~)9i~
emitter voltage VBE of the transistor Trl or Tr2.
Thus, in the embodiments of the invention, when a stitch pattern is selected by operating one of the pattern selecting switches of selector 51, a signal is issued, and the solenoid 18 is energized to disengage the read-out member 2 from the mechanical memory 1, and then the reversible motor 22 is driven. This reversible motor displaces the moving member 25 on the shaft 26 relative to the mechanical memory 1 through the worm 28 and the worm wheel 29. The displac~ment of the cam follower 2 continues until the potential difference becomes 0 between the command voltage from the D/A converter 52 and the voltage fed back from the position senser 30. Thus, the follower member 2 is exactly stopped at the desired position relative to thè mechanical memory or the pack ofipattern cams 1.
Reference will now be made to another embodiment shown in Figure 8. Within the machine frame of the sewing machine (not shown) there is arranged a mechanical memory 55 which stores a plurality of stitch patterns, namely a pack of disc-like cams to be rotated in synchronism with rotation of the main shaft of the sewing machine (not shown).
A first read-out member 56, namely, a cam follower, for extracting information from the memory 55, is arranged opposite to the memory 55. The cam follower 56 with a boss , 56a is slidably mounted on a shaft 57 and is slidable in parallel to and relative to the pack of pattern cams 55.
The b~s 56a is formed with a groove 56c in the-circumference thereof. A fork 56b formed in the lower end of the cam follower 56 engages a transverse shaft 60 supported between ~;30 a pair of arms 58, 59 which are swingable around the shaft 57. A swing arm 61 is swingably mounted at one end of the shaft 57 and is, at the lower end thereof, _onnected to one ` , -" l()~i;.~3~
end of the shaft 60. Therefore the swing arm 61 is swung ` around the shaft 57 when the cam follower 56 is swurg around the shaft 57. A pin 63 positioned on a transmission rod 62 `~ is pressed against an inclined face 61a of the swing arm 61 by means of a spring (not shown). The transmission rod 62 is at one end connected to a swing frame (not shown) support-, . .
ing the needle bar and is at the other end connected to a ., .
link 69 which is in turn connected to an adjusting arm 68 which is turnably mounted on the machine frame by means of a pivot 67 and is urged by a spring 66 to a bight adjusting arm 65 fixed to a bight control shaft 64 which is rotatably supported on the machine frame. A manually operated dial 70 is mounted on one end of the shaft 64 which projects out of the machine frame. The bight adjusting cam 65 is connected to a reversible motor M2, for example, servometer, via a gear wheel 72 secured to the control shaft 64 and a pinion 71 fixed to the rotary shaft of the reversible motor M2. A
position detector VR2 is also mounted on the control shaft 64 for sensing the position of the reversible motor M2.
' 20 The second read-out member 73, the feed control cam follower, is arranged opposite to the memory 55. The f,eed control cam follower 73 with a boss 73a is slidably mounted on the shaft 57 and is slidable in parallel to and relative to the pack of cams 55. The boss 73a is formed with a groove 73c in the circumference thereof. A fork 73b formed in the cam follower 73 engages a transverse shaft 76 supported by the arm 74 and by the feed control arm 75 which are swingably mounted on the shaft 57. The feed contr 1 arm 75 is at its one end connected to a feed adjusting rod 77 which is connected to a feed adjusting device (not shown) for adjusting the feed-ing amount and the feeding direction. A pawl 75a at the other end of the feed control arm 75 is, by the action of the `' -~ spring 80, in engagement with a feed controlling cam 79 secured to a feed controlling shaft 78 which is rotatably , supported on the machine frame. A manually operated dial 81 is fixed to one end of the shaft 78 which projects out of the machine frame.
The feed adjusting cam 79 is connected to a reversible motor M3 via a gear wheel 83 which is secured to the control shaft 78 and engages a pinion 82 flxed to the rotary shaft of the reversible motor M3. A position detector VR3 is mounted on the shaft 78 for sensing the position of the reversible motor M3. The grooves 56c, 73c of bosses 56a, 73a of the cam followers 56, 73 are respectively engaged by pins 86a, 87a each provided at one end of a bight selecting lever 86 and of a feed selecting lever 87 which are each turnable on pivot shafts 84, 85. Pawls 86b, 87b each formed at the other end of the selecting levers 86, 87 are engaged by a spring 91 with a bight selecting cam89 and a feed selecting cam 90, respectively, which are fixed on a vertical shaft 88 rotatably supported on the machine. The selecting cams 89, 90 are connected to a reversible motor Ml via a gear 93 which is secured to the shaft 88 and engages a pinion 92 fixed to a rotary shaft of the reversible - motor (Ml). A position detector VRl is mounted on the shaft 88 for sensing the positlon of the reversible motor Ml.
Figure 9 shows an embodiment for changing the needle hole of a needle plate and for adjusting the height of a feed dog. Reference will now be made to this embodiment.
A slide element 95 is formed with a small hole for a straight stitching and is slidingly movable on the needle plate relative to the slot-type needle hole of the needle plate.
The element 95 is at one end connected to one end of a lever 97 pivoted on a shaft 96 via an elastic member 98, and a pawl .
1.3~3;~
.
- 97a formed at the other end of the lever 97 is engaged by a ~ spring 101 to a cam 100 which is secured to a shaft 99 - rotatably supported on the machine frame. A plunger 104 engaging the under side of a feed plate 103 formed with a feed dog 102 is connected via an elastic member 107 to one end of a lever 106 pivoted on a shaft 105. A pawl 106a formed at the other end of the lever 106 is engaged by a spring 109 to a cam 108 fixed to the shaft 99. The cams - 100, 108 are connected to reversible motor M4 via a gear secured to the shaft 99 and engaging a pinion 110 of,the reversible motor M4. A position detector VR4 is provided " for sensing the position of the-reversible motor M4.
'~ Figure 10 shows another embodiment according to the invention. In Figure lO(a), the bight adjusting shaft 64 shown in Figure 8 is terminated at the bight adjusting cam 65, and a manual bight adjusting shaft 112 is rotatably supported on the machine frame in parallel to the shaft 64.
A manual bight adjusting dial 70a is secured to one end of the shaft 112 and a manual bight adjuster RB is mounted on the other end of the shaft 112. In Figure lO(b), the feed adjusting shaft 78 shown in Figure 8 is terminated at the feed adjusting cam 79, and a manual feed adjusting shaft 113 is rotatably supported on the machine -frame. A ~anual feed adjusting dial 81a is secured to one end of the shaft 113 and a manual feed adjuster RF is mounted on the other end of the shaft 113.
The operation of the embodiment in Figure 8 will be discussed. If any one of the pattern selecting switches provided on the front part of the sewing machine is operated, the following operation is-performed in steps which have been ~ in advance electrically programmed. A solenoid for the - clutch mechanism!(not shown) is actuat~d to rotate the machine ~ - 12 _ lO9i;33;~
, motor at a low speed so as to stop the needle bar at the upper dead point. Subsequently, each of the reversible motors M2, M3 is rotated to disengage the bight cam follower 56 and the feed cam follower 73 from the pack of cams 1, and then the motors are stopped.
At the same time, the reversible motor M4 in Figure 9 is rotated to operate the slide element 95 and the plunger 104 so as to determine the needle hole and the height of the feed dog 102 in accordance with the pattern selected, and then the motor 114 is stopped. Subsequently the reversible motor Ml is xDtated to displace the followers ~r 56, 73 along the pack of cams 1 to the selected ones of these -~ cams 1, and then the motor Ml is stopped. Then the reversible ; motors M~, M3 are again rotated to engage the cam followers 56, 73 to the respective selected cams via the transmission rod 62 and the swing shaft 60, and via feed control arm 75 and the swing shaft 60 respectively, and then the motors M2, M3 are stopped. Thus, the manual bight adjusting dial 70 and the manual feed adjusting dial 81 can now be used to pro-vide the manual adjustment if desired, the automatic setting for pattern selecti onhaving been finished. In case the buttonhole stitch is selected by the corresponding pattern selecting switch, the automatic setting is of course possible therefor, but if desired manual adjustment is carried out by the dials 70, 81 and then the manually selected value is memorized electrically. For example, if the pattern selecting switch for the buttonho stitch is operated to form the first left sid~ line tack stitches, the following right side line tack stitches are formed with the same bight and with - 30 the same feeding pitch. Thereafter, the stitching in accordance with the manual setting will be repeated for each successive opeFation. It is possible to again return to the -7~ - 13 -, automatic setting by once pushing another pattern selecting switch.
In the embodiment of Figure 10, when any one of the pattern selecting switches (S) is operated, the needle bar stops at the upper dead point, and the followers 56, 73 are , disengaged from the pack of cams 1 by the reversible motors ~'r' M2, M3, and at the same time the slide element 95 and the , . .
' plunger 104 in Figure 9 adjust the needle hole and the , height of the feed dog 102 in accordance with the selected ` 10 pattern by operation of the reversible motor M4. Subsequently the reversible motor Ml is rotated to displace the followers 56, 73 along the cams 1 to the selected ones. Subsequently the bight adjusting rod 62 and the feed adjusting rod 77 are moved by the reversible motors M2, M3 to the position .; associated with the selected pattern, and the clutch mechanism , is released and the automatic setting for pattern selection is finished. Then these motors M2, M3 however, remain active in a steady-state condition, differentially from the embodiment in Figure 8. Subsequently when the manual bight adjusting dial 70a and the manual feed adjusting dial 81a are adjusted to desired positions, and then one or both of a manual bight switch~and a manual feed switch on the machine frame is operated, the resultant data are issued to rotate one or both of the reversible motors M2, M3 and the bight adjusting rod 62 and the feed adjusting rod 77 are operated respectively to the adjusted positions. Thus, the manual setting is finished. When the pattern selecting switch S
is again operated, the manual setting is switched to the above mentioned automatic setting; if another pattern selecting switch is operated, the automatic setting of a different pattern is obtained.
,~
' - - 14 -.....
An explanation will be made of the electric circuit shown in Figure 11 which is used in combination with the embodiment of this invention shown in Figure 8 and Figure 9.
Pattern selecting switches Sl-S8 of a pattern selector S are arranged on the front part of the sewing machine, and , are each at one end grounded and at the other end connected to ; the input terminals Dl-D8 of a program control unit PCU.
.. . .
- Vcc is a DC power source for the control circuit. R-R are normal biasing resistors which make the values of the input terminals Dl-D8 of the program control unit PCU 1 or O in - response to opening or closing of the switches Sl-S8. The program control unit PCU is responsive to the signals received at the input terminals Dl-D8 and the input terminals INl, IN2, IN3, and issues at the output terminals OUTl-OUT6 the signals for controlling the reversible motors Ml-M4, ,~
power amplifiers A2, A3 and the magnetic solenoid SOL for the clutch mechanism stopping the sewing machine at a pre-determlned position. The respective output terminals OUTl-OUT4 are connected to D/A converters DAl-DA4, summing junctions (a)-(d), power amplifiers Al-A4, and to the reversible motors Ml-M4. The outputs of position detectors VRl-VR4, which de~ect the positions of the cams 65, 79, 89, 90, 100, 108, driven by these motors are respectively connected to the junctions (a)-(d) where the outputs of the position detectors and the data from the converters ADl-AD4 are respectively compared. If there are differences between the compared data, the revers~ble motors continue to rotate. If the compared data are each equal, the reversible motors Ml-: M4 are stopped in a steady-state condition. Namely when the output data of the D/A converters match the data at the positions of said cams; the outputs of the respective power amplifiers Al-A4 become 0, and the reversible motors Ml-M4 , ~ - 15 _ are stopped. The outputs of the position detectors VR2, VR3 are each connected to input terminals IN2, IN3 respectively of the program control unit PCU via A/D converters AD, AD', ~ so that the data of the respective position detectors may be ^~- memorized by the unit PCU. When one of the pattern selecting switches S, for example a switch for a buttonhole is selected, the position detectors VR2, VR3 memorize-the data when they are adjusted by the manual dials 16, 27 for the needle bight and the cloth feed, and enable the sewing machine to repeatedly form a pattern exhibiting the selected ,~ bight and feed pitch. The output terminal OUT6-is for ~-` making 0 the outputs of the power amplifiers A2j A3, whèn the automatic setting of a pattern selection is finished, to render the reversible motors M2, M3 inactive, and the motors will not be affected if the detectors VR2, VR3 are manually adjusted. A magnetic solenoid SOL is operated by a signal from the output terminal OUT5 of the program control unit PCU to connect and disconnect the main shaft of the sewing machine to and from the clutch mechanism CL-for stopping the needle bar at a predetermined position (the upper dead point in this case). An actuating part of the solenoid is equipped with a switch for operating a driving circuit CM
of the machine motor. Therefore when the solenoid is energized the machine motor MS can be rotated at a low speed, irrespectively of a controller (not shown) of the sewing machine. When the needle bar has been brought to the upper dead point, the needle bar is stopped there by the clutch mechanism CL, and at the same time a signal detecting , the needle bar at the upper dead point is given to the input terminal INl, and the machine motor MS continues to idly rotate until said solenoid is deenergized.
''' " . ' Explanation will be made of the embodiment in Figures 10(a) and 10(b) in combination with the mechanism in Figure 9 and controlled by the electric circuit in Figure 12.
In the electric circuit, SB is a manual bight control switch.
SF is a manual feed control switch. They are each at one end grounded and are each at the other end connected to input terminals IN6 of a program control unit PCU.' After any one -'~, of the pattern selecting switches Sl-S8 is operated, the manual operation of one or both of the switches SB, SF will provide the following manual adjusting operation. AS2, A'S3 are analog switches and usually render the automatic side effective as shown. These analog switches cause'one or both of the manual bight adjustor RB and the manual feed adjuster RF to be effective through the signals from the output terminals OUT6, OUT6' of the program control unit PCU when one or both of the switches SB, SF isjare operated.
The operation of the electric circuit is as follows:
In Figure 11, when any one of the pattern selecting switches Sl-S8 is operated, the magnetic solenoid SOL is energized by a signal from the output terminal OUT5 of the program control unit PCU to make effective the clutch mechanism CL
for stopping the needle bar at the determined position, and to operate the drive circuit CM of the machine motor MS to rotate the machine motor at a low speed. The sewing machine is stopped by the clutch mechanism CL when the needle bar has been raised to the upper dead point, and the machine ' motor continues to idly rotate. When a signal confirming the needle bar at the upper dead point is given to the input terminal INl, the reversible motors M2, M3 are rotated by signals from the output terminals OUT2, OUT3 until the --pattern cam followers 56, 73 are disengaged from the pack of cams 1, whereupon,motors M2, M3 have now reached a steady-.
- 17 _ 3 ~
.`:
state and therefore stop. Simultaneously the reversible motor M4 is rotated by the signals issued from the output terminals oUT4 by the selected switch, and moves the slide element 95 and the feed dog 104 to the positions associated with the selected pattern, and then the motor is stopped in a steady-state. Subsequently the reversible motor Ml ;-~` is rotated by the signals from the output terminals OUTl, ;: ~
and displaces the cam followers 56, 73 relative to the pack ` of cams 1 to be selected ones thereof, and then the motor is stopped. Then the reversible motors M2, M3 are re-rotated by the signals from the output terminals OUT2, OUT3 to engage the cam followers 56, 73 to the selected cams, and also to adjust the bight adjusting rod 62 and the feed adjusting rod 77 to'the relative positions in accordance to the selected pattern. Simultaneously the solenoid SOL
is deenergized to stop the machine motor MS, the outputs ' from the power amplifiers A2, A3 are made O by the signal fromthe output terminal 0UT6, and the reversible motors M2, M3 are made inactive. Thus the automatic pattern selection - 20 is finished. IIf then manual adjustment is further desired, the bight and the feed can be adjusted by operating the respective manual controldials 70, 81. In this case, the setting values of the position detectors VR2, VR3 are varied, , but the reversible motors M2, M3 will not be re-rotated.
'~ When the buttonhole stitch is selected by one of the switches Sl-S8, the automatic setting is provided as explained above, and subsequently the manual adjustments can be performed using the manual adjusting dials 70, 81. ~amely in the first place, a switch for the left side line tack ~; .
stitches of a buttonhole is operated, and then the manual adjusting dials 70, 81 are operated to determine the bight and feed pitches in accordance to the selected buttonhole. After - 18 _ the left side line tack stitches have been terminated, a switch for the rlght side line tack stitches is operated, Then the program control unit PCU is operated to automatically select a cam for such stitches, and after that, the reversible motors M2, M3 are re-rotated to automatically set the bight and the feed pitches which are the same as those of the just sewn left side line tack stitches based on the data memorized from the previously operated manual adjusting dials 70, 81. The subsequent left line tack stitches and the right line tack stitches can be provided by repeated operations of the two switches with the same needle bight and the same feed pitches, For returning to the automatic setting, a pattern selecting switch other than the buttonhole switches is operated.
In Figure 12 showing another embodiment, when any one of the pattern selecting switches Sl-S8 is opèrated, i the needle bar is stopped at the upper dead point as in the preceding embodiment and the cam followers 56, 73 are disengaged from the cams 1 by the reversible motors M2, M3, and then the respective motors are stopped. At the same time the reversible motor M4 moves the slide element 95 and the feed dog 104 to the positions associated with the -selected pattern, and then the motor is stopped. Then the ;~ reversible motor Ml displaces the cam followers to the selected positions relative to the cams 1. Subsequently, the reversible motors Moe, M3 engage the cam followers to the ? selected cams and also adjust the bight adjusting rod 62 and the feed adjusting rod 77 to the positions associated with the selected pattern and then the motors are stopped.
Then the solenoid SOL is deenergized and the machine motor MS is stopped to finish the automatic selecting of pattern cams, When manual adjustment is desired, either or both of '.E~ - 19 _ - , .
~J9i3~33 ,:..
the manual bight switch SB and the manual feed switch SF is/
are operated to connect in the manual bight adjustor RB and/
or the manual feed adjustor RF. If one or both of the manual adjusting dials 70a, 81a is/are operated before or after this change-over, the generated data are memorized . in one or both of the adjustors RB,RF, and one or both of the reversible motors M2, M3 is/are rotated to operate the bight adjusting rod 62 and the feed adjusting rod 77 to the positions determined by the memorized data, and thus the manual setting is finished. In this ernbodiment, the buttonhole can be obtained;in the same manner as in the preceding ernbodlment;shown in Figures 8, 9 and 11.
: ~ .
.. ' ~ .
~
.,~.,: . ,.
:
., '`'';
~ - 20 -
Claims (12)
1. In a sewing machine of the type comprising a pack of pattern cams rotatable in synchronism with sewing-machine operation and a cam follower coupled to the machine's stitch-forming instrumentalities and mounted to track se-lected ones of the pattern cams, an improved pattern-selection system comprising, in combination, user-operated pattern-selecting means operated by the user for selecting a stitching pattern and generating when operated pattern-selection signals;
a program-control unit including a static memory having inputs receiving the pattern-selection signals and having outputs, and producing at its outputs, in response to the pattern-selection signals, cam-selection and follower-control signals determined by what pattern the user has selected:
electromagnetic follower-control means responding to the follower-control signals by causing the cam follower¦
to move out of engagement with the pack of pattern cams preliminary to axial shifting of the follower from one to another of the pattern cams and operative for thereafter returning the cam follower into engagement with the pack of pattern cams;
and cam-selecting means responding to the cam-selection signals by causing the cam follower to shift in the direction axially of the pack of pattern cams from one pattern cam to the pattern cam corresponding to the pattern the user has selected, the cam-selecting means including a reversible electric motor having an electrical input and a mechanical output, motor-control circuit means having an input connected to receive the pattern-selection signals and having an output connected to the electrical input of the reversible electric motor and controlling the energization and direction of operation of the latter, and coupling means coupling the mechanical output of the reversible electric motor to the cam follower for convert-ing the motion generated by the reversible electric motor into axial shifting movement of the cam follower. --
a program-control unit including a static memory having inputs receiving the pattern-selection signals and having outputs, and producing at its outputs, in response to the pattern-selection signals, cam-selection and follower-control signals determined by what pattern the user has selected:
electromagnetic follower-control means responding to the follower-control signals by causing the cam follower¦
to move out of engagement with the pack of pattern cams preliminary to axial shifting of the follower from one to another of the pattern cams and operative for thereafter returning the cam follower into engagement with the pack of pattern cams;
and cam-selecting means responding to the cam-selection signals by causing the cam follower to shift in the direction axially of the pack of pattern cams from one pattern cam to the pattern cam corresponding to the pattern the user has selected, the cam-selecting means including a reversible electric motor having an electrical input and a mechanical output, motor-control circuit means having an input connected to receive the pattern-selection signals and having an output connected to the electrical input of the reversible electric motor and controlling the energization and direction of operation of the latter, and coupling means coupling the mechanical output of the reversible electric motor to the cam follower for convert-ing the motion generated by the reversible electric motor into axial shifting movement of the cam follower. --
2. The pattern-selection system defined in claim 1, the motor-control circuit means including a feedback transducer coupled to and driven by the mechanical output of the reversible electric motor and generating feedback signals indicative of the position of the cam follower measured in the direction axially of the pack of pattern cams, and servo circuit means receiving both the cam-selection signals and the feedback signals and having an output connected to the electrical input of the rever-sible electric motor and controlling the energization and direction of operation of the latter in dependence upon the¦
discrepancy between the feedback and cam-selection signals. --
discrepancy between the feedback and cam-selection signals. --
3. The pattern-selection system defined in claim 1, wherein the electromagnetic follower-control means comprises a second reversible electric motor having an electrical input and a mechanical output, motor-control circuit means having an input connected to receive the follower-control signals and having an output connected to the electrical input of the second reversible electric motor and controlling the energization and direction of operation of the latter, and coupling means coupling the mechanical output of the second reversible electric motor to the cam follower for converting the motion generated by the second reversible electric motor into movement of the cam follower into and out of engagement with the pack of pattern cams. --
4. The pattern-selection system defined in claim 3, the motor-control circuit means of the follower-control means including a feedback transducer coupled to and driven by the mechanical output of the second reversible electric motor and generating second feedback signals indicative of the position of the cam follower considered in the direction in which the follower moves into and out of engagement with the pack of pattern cams, and servo circuit means receiving the follower-control signals and the second feedback signals and having an output connected to the electrical input of the second reversible electric motor and controlling the energization and direction of operation of the latter in dependence upon the discrepancy between the second feedback and follower-control signals.--
5. The pattern-selection system defined in claim 1, the electromagnetic follower-control means com-prising a plunger-type electromagnet coupled to the cam follower for moving the cam follower into and out of en-gagement with the stack of pattern cams. --
6. The pattern-selection system defined in claim 2, the feedback transducer being a rotary potentio-meter coupled to the mechanical output of the reversible electric motor. --
7. The pattern-selection system defined in claim 2, the feedback transducer being an elonged variable resistor comprised of a stationary part and a wiper, the wiper being coupled to the cam follower and shifting along the length of the stationary part as the cam follower shift in the direction axially of the pack of pattern cams. --
8. The pattern-selection system defined in claim 4, the feedback transducer of the follower-control means and likewise the feedback transducer of the cam-selecting means each being a rotary potentiometer coupled to the mechanical output of the respective one of the two recited reversible electric motors. --
9. The pattern-selection system defined in claim 1, the follower-control means furthermore including a locking mechanism operative when the cam follower is in engagement with the pack of pattern cams for precluding shift-ing of the cam follower in the direction axially of the pack of pattern cams, whereby to preclude destruction of the follower and/or of the coupling means if the cam-selecting means due to malfunction improperly attempts to shift the cam follower while the later is in engagement with the pack of pattern cams.--
10. The pattern-selection system defined in claim 3, the cam follower and pack of pattern cams being part of an adjustable-amplitude motion generator, the tracking of a selected pattern cam by the cam follower determining the motion generated but the motion generator being provided with motion-multiplying means adjustable in setting for increasing and decreasing the motion generated by the cam follower and cooperating pattern cam, the coupling means of the follower-control means coupling the mechanical output of the second reversible electric motor to both the cam follower and the motion-multiplying means, and the program-control unit producing follower-control signals which additionally determine what the motion-multiplying factor will be, whereby in addition to causing the cam follower to move into and out of engagement with the pack of pattern cams the second re-versible electric motor, under the control of the program-control unit, also adjusts the motion-multiplying factor as a function of the selected pattern. --
11. The pattern-selection system defined in claim 10, the coupling means of the follower-control means including a mechanical component provided with a user-operated selecting element for user-performed adjustment of the motion-multiplying factor, the reversible electric motor moving the cam follower into and out of engagement with the pack of pattern cams through the intermediary of the mechanical component, whereby when the reversible electric motor brings the cam follower into engagement with a pattern cam it simultaneously performs an automatic selection of the motion-multiplying force which, however, can be followed by manual modification of the motion-multiplying force. --
12. The pattern-selection system defined in claim 11, furthermore including a feedback transducer coupled to and driven by the reversible electric drive motor and generating a feedback signal indicating the position of the mechanical output of the motor, the program-control unit having memory inputs receiving the feedback signal for memorizing the position of the mechanical output of the motor, whereby if the user has manually adjusted the motion-multiplying factor the factor selected by the user can be memorized for later repetition. --
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9314476A JPS5815158B2 (en) | 1976-08-06 | 1976-08-06 | Sewing pattern selection device for sewing machine |
| JP93144/76 | 1976-08-06 | ||
| JP109312/76 | 1976-09-11 | ||
| JP10931276A JPS5336345A (en) | 1976-09-11 | 1976-09-11 | Stitch pattern selector for sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1091333A true CA1091333A (en) | 1980-12-09 |
Family
ID=26434573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA284,064A Expired CA1091333A (en) | 1976-08-06 | 1977-08-04 | Sewing machine with a stitch pattern selecting device |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4196683A (en) |
| AU (1) | AU516247B2 (en) |
| CA (1) | CA1091333A (en) |
| DE (1) | DE2735428C2 (en) |
| GB (1) | GB1580147A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5422258A (en) * | 1977-07-19 | 1979-02-20 | Janome Sewing Machine Co Ltd | Device of selecting pattern of sewing machine |
| JPS6044943B2 (en) * | 1978-02-08 | 1985-10-07 | ブラザー工業株式会社 | Pattern information reproducing device for sewing machines |
| JPS54159047A (en) * | 1978-06-03 | 1979-12-15 | Sharp Kk | Electric sewing machine |
| JPS602073B2 (en) * | 1978-06-13 | 1985-01-18 | シャープ株式会社 | electric sewing machine |
| EP0009107B1 (en) * | 1978-09-14 | 1984-06-13 | Dorina Nähmaschinen GmbH | Zigzag sewing machine with a device for producing decorative stitches |
| JPS55129085A (en) * | 1979-03-26 | 1980-10-06 | Janome Sewing Machine Co Ltd | Electronic sewing machine |
| JPS5669364U (en) * | 1979-11-05 | 1981-06-09 | ||
| JPS59114882U (en) * | 1983-01-20 | 1984-08-03 | 蛇の目ミシン工業株式会社 | Control amount switching mechanism in electronic sewing machines |
| US4658744A (en) * | 1985-02-28 | 1987-04-21 | Happy Mishin Seizou Kabushiki Kaisha | Cam-using electronic control sewing machine |
| US4873932A (en) * | 1989-02-01 | 1989-10-17 | Ssmc Inc. | Stepper driven stitch patterning mechanism for sewing machines using spiral cam groove and follower |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3518955A (en) * | 1967-11-25 | 1970-07-07 | Aisin Seiki | Pattern stitch sewing machine |
| DE1997589U (en) * | 1968-07-26 | 1968-11-28 | Wittenberge Naehmasch Veb | ZIGZAG TOWING MACHINE WITH STITCH SELECTION DEVICE |
| US3795210A (en) * | 1973-04-26 | 1974-03-05 | Singer Co | Cam selection module |
| US3872808A (en) * | 1973-07-05 | 1975-03-25 | Singer Co | Sewing machine stitch pattern selection from data stored in a multiple pattern static memory |
| DE7500146U (en) * | 1974-01-08 | 1975-07-17 | The Singer Co | Decorative stitch sewing machine |
| US3874312A (en) * | 1974-01-23 | 1975-04-01 | Singer Co | Electric cam selector mechanism for sewing machines |
| US4016821A (en) * | 1975-07-16 | 1977-04-12 | The Singer Company | Electronic control of bight, feed and feed balance in a sewing machine |
| JPS5221966A (en) * | 1975-08-11 | 1977-02-18 | Janome Sewing Machine Co Ltd | Pattern can selector for sewing machine |
| US4066029A (en) * | 1976-01-12 | 1978-01-03 | The Singer Company | Electromechanical remote cam selector for sewing machines |
-
1977
- 1977-08-04 CA CA284,064A patent/CA1091333A/en not_active Expired
- 1977-08-05 DE DE2735428A patent/DE2735428C2/en not_active Expired
- 1977-08-05 GB GB33000/77A patent/GB1580147A/en not_active Expired
- 1977-08-08 US US05/822,692 patent/US4196683A/en not_active Expired - Lifetime
- 1977-08-08 AU AU27712/77A patent/AU516247B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2735428C2 (en) | 1982-12-09 |
| DE2735428A1 (en) | 1978-02-09 |
| AU516247B2 (en) | 1981-05-28 |
| US4196683A (en) | 1980-04-08 |
| GB1580147A (en) | 1980-11-26 |
| AU2771277A (en) | 1979-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1091333A (en) | Sewing machine with a stitch pattern selecting device | |
| US4182249A (en) | Automatic buttonhole apparatus for use with sewing machine | |
| US4315472A (en) | Electronic sewing machine | |
| US4063525A (en) | Automatic zigzag sewing machine | |
| US3143985A (en) | Ornamental seam devices for sewing machines | |
| US4393795A (en) | Electronic sewing machine | |
| US3834332A (en) | Arrangement on a zig-zag or automatic sewing machine for the adjustment of the stitch position and width of the stitch | |
| US4313389A (en) | Sewing machine with a pattern selecting device | |
| US3705561A (en) | Cyclic sewing machine | |
| US4334486A (en) | Electronic sewing machine | |
| JPH0154068B2 (en) | ||
| US4145983A (en) | Feed regulating mechanism for a sewing machine | |
| US4401042A (en) | Electronic control sewing machine | |
| US4658744A (en) | Cam-using electronic control sewing machine | |
| US5063867A (en) | Zigzag sewing machine | |
| US4368683A (en) | Sewing machine with feed dog dropping system | |
| GB1274979A (en) | ||
| US4066029A (en) | Electromechanical remote cam selector for sewing machines | |
| USRE29951E (en) | Bight stop mechanism for sewing machines | |
| GB1304044A (en) | ||
| JPH03112588A (en) | Sewing machine differential feed device | |
| US4380204A (en) | Needle and feed cam arrangement for a zig zag sewing machine | |
| US4497267A (en) | Low torque pattern selecting mechanism for a sewing machine | |
| US4406238A (en) | Sewing machine with cyclic pattern stitching device | |
| JPS6357077B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |